From 169491113a342e147e8abb1f5a944cf0f2430d32 Mon Sep 17 00:00:00 2001 From: Alpha Chen Date: Fri, 17 Dec 2021 08:30:50 -0800 Subject: [PATCH] [2021][ruby][17.x] a bit of refactoring --- 2021/ruby/day_17.rb | 38 +++++++++++++++++--------------------- 1 file changed, 17 insertions(+), 21 deletions(-) diff --git a/2021/ruby/day_17.rb b/2021/ruby/day_17.rb index 2cd1645..6582818 100644 --- a/2021/ruby/day_17.rb +++ b/2021/ruby/day_17.rb @@ -1,33 +1,29 @@ -class Probe - def initialize(velocity, target) - @velocity, @target = velocity, target - end - - def each - return enum_for(__method__) unless block_given? +def fire(v, target) + return enum_for(__method__, v, target) unless block_given? - pos = [0,0] - velocity = @velocity.clone + pos = [0,0] + v_x, v_y = v - loop do - yield pos + loop do + yield pos - return if @target.zip(pos).all? { _1.cover?(_2) } + return if target.zip(pos).all? { _1.cover?(_2) } - pos = pos.zip(velocity).map { _1.sum } - velocity[0] -= 1 if velocity[0] > 0 - velocity[1] -= 1 + pos = pos.zip([v_x, v_y]).map { _1.sum } + v_x -= 1 if v_x > 0 + v_y -= 1 - return if pos[0] > @target[0].end - return if pos[1] < @target[1].begin - end + return if pos[0] > target[0].end + return if pos[1] < target[1].begin end end input = ARGF.read.scan(/x=(.+), y=(.+)/) target = input[0].map { eval(_1) } -haystack = (0..256).flat_map {|x| (-256..256).map {|y| [x, y] }} -haystack.select! {|v| Probe.new(v, target).each.any? {|pos| target.zip(pos).all? { _1.cover?(_2) }}} -# p haystack.map {|v| Probe.new(v, target).each.map { _2 }.max }.max +xs = (0..target[0].end).select { (1.._1).sum > target[0].begin } +haystack = xs.flat_map {|x| (-256..256).map {|y| [x, y] }} +haystack.select! {|v| fire(v, target).each.any? {|pos| target.zip(pos).all? { _1.cover?(_2) }}} + +# p haystack.map {|v| fire(v, target).each.map { _2 }.max }.max p haystack.count